Those are the actual voice actors for the characters Scar and Wrath. The studio who made the anime also made a bunch of these short 1-2 minute videos purely for comedic value using characters from the show.

This is irrelevant but it always makes me lol when I see people posting copyrighted shit on youtube and saying silly shit like "I don't own this I just want other people to see it please don't sue me!"

Well that video has been taken several times from youtube because of that. Until now you can only find that Ending song on dailymotion. If the user thinks the video will last because of the "Not mine, I'm sorry" quote then good for him I guess.